Trek Knock Block Complete Headset Assembly yc-335 running standard derailleurs (non-direct mount)

running standard derailleurs (non-direct mount)

and properly assembled

Includes two 6803 bearings

2025 Rise SL Carbon OMR 29"

and the design is confirmed e-bike compatible for riders who need a kickstand on their electric bike

Trek Knock Block Complete Headset Assembly yc-335 running standard derailleurs (non-direct mount)Compatible with all Trek Knock Block models Includes crown race, bearings, top cover, frame chip & fastener Must be paired with Knock Block stem and Knock Block spacers Knock Block headset spacers not included Steerer outer diameter: 28. 6mm (1 1 8") 38. 1mm (1 1 2") Crown race inner diameter: 39. 8mm Upper Bearing: 30. 2 x 41 x 6. 5mm Lower Bearing: 40 x 51. 8 x 8mm Stack height: 8. 7mm